Specially designed search tools are capable of recognizing them when queried for resources that have a specific license type.
Tools for embedding CC licences.
- PDF license manager - "a simple Java program to insert a Creative Commons License in a PDF document"
- Creative Commons Add-in for Microsoft Office - "enables you to embed Creative Commons licenses directly into Word, PowerPoint, and Excel documents."
Tools for discovering resources with CC licenses
- Google - Advanced search, choose from a selection of Usage Rights.
- Yahoo - Advanced search has a Creative Commons Search feature available as a beta release.
- Browser plugins - detect and display licence information while visiting web pages, add CC search panels or sidebars.
Thanks to Catalogablog for the link to PDF license manager.